Pressure-sensitive adhesive tape
An adhesive tape has adhesive strength with high high-load holding power, temporal repeelability, and storage stability. The adhesive tape includes a substrate layer and an adhesive layer. The substrate layer has a breaking stress in a range of 1 to 100 MPa and an elongation at break in a range of 300% to 3000%. The adhesive layer contains a tackifier resin and a triblock copolymer with a repeating unit represented by the general formula (1): A, B, and C independently denote a repeating unit. A and C independently denote an alkyl methacrylate monomer unit and B denotes an alkyl acrylate monomer unit. p, q, and r independently denote the degree of polymerization of their respective monomer units. A and C may be the same or may denote an alkyl methacrylate monomer unit with a different chemical structure. * denotes a bonding arm to another atom.
1. An adhesive tape comprising:
a substrate layer; and
an adhesive layer comprising a filler,
wherein:
the substrate layer has a breaking stress in a range of 1 to 100 MPa and an elongation at break in a range of 300% to 3000%,
the adhesive layer contains a tackifier resin and a triblock copolymer with a repeating unit represented by the general formula (1):
A, B, and C independently denote a repeating unit,
A and C independently denote an alkyl methacrylate monomer unit,
B denotes an alkyl acrylate monomer unit,
p, q, and r independently denote a degree of polymerization of monomer units respectively,
A and C are the same or denote an alkyl methacrylate monomer unit with a different chemical structure,
* denotes a bonding arm to another atom,
a content of the triblock copolymer in the adhesive layer is in a range of 30% to 100% by mass, and
a particle size distribution D90/D10 of the filler is in a range of 2.5 to 20.
2. The adhesive tape according to claim 1 , wherein the triblock copolymer has a weight-average molecular weight Mw in a range of 50,000 to 300,000 and a number-average molecular weight Mn in a range of 50,000 to 300,000.
3. The adhesive tape according to claim 1 , wherein the tackifier resin has a softening point of 95° C. or more.
4. The adhesive tape according to claim 1 , wherein a softening point temperature° C. of the tackifier resin×an addition amount of the tackifier resin ranges from 1300 to 13,000, wherein the addition amount of the tackifier resin is 100 parts by mass of the triblock copolymer.
5. The adhesive tape according to claim 1 , wherein the substrate layer contains a vinyl aromatic block copolymer.
6. The adhesive tape according to claim 1 , wherein the adhesive tape has a peel adhesive strength of 5 N/20 mm or more.
7. The adhesive tape according to claim 1 , wherein the adhesive tape has a shear strength of 1.0 MPa or more.
8. The adhesive tape according to claim 1 , wherein the adhesive layer contains 10 to 150 parts by mass of the tackifier resin per 100 parts by mass of the triblock copolymer.
9. The adhesive tape according to claim 1 , wherein the filler is an organic filler.
10. The adhesive tape according to claim 1 , wherein the filler is a silicone filler.
11. The adhesive tape according to claim 10 , wherein the filler is selected from the group consisting of silicone rubber particles, acrylic-modified silicone particles, and combinations thereof.